JPH054092Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a magnetic recording/reproducing device in which the tape winding angle is 90 degrees, such as a digital audio tape recorder, and relates to a mounting arrangement of a rotating magnetic head.

[Prior Art] Conventionally, as a magnetic recording/reproducing apparatus using a rotating magnetic head, a drum is used in a home video tape recorder as shown in the main part plan view and recording pattern diagram of the magnetic recording/reproducing apparatus in FIGS. 6a and 6b. Recording and reproducing heads 2 and 3 for channels 1 and 2 are arranged at 1, and the erasing head 4 is a fixed head placed in front of the drum 1 into which the magnetic tape 5 enters, as shown by b. During recording, the entire width of the tape is erased perpendicularly to the longitudinal direction of the tape 5, and the recording and reproducing heads 2 and 3 of channels 1 and 2 attached to the drum 1 alternately record in a helical scan method. Ta.

[Problems to be solved by the invention] However, in the case of a video tape recorder as a magnetic recording/reproducing device of this conventional configuration, as the device becomes smaller, it becomes difficult to secure a fixed position for the erasing head. This was difficult due to the design, and in order to reduce the time when there was no signal between recording splices, the recorded portion was erased before being turned back a little. In addition, when inserting other signals onto a recorded tape, overlapping recording was performed without operating the erasing head, so in this case, some of the previous signal remained and the playback signal when played back. There were problems such as poor quality and a dirty screen, and there was a risk that similar problems would occur in digital audio tapes as long as the same configuration was used.

[Means for Solving the Problems] In order to solve the above problems, the present invention arranges an erasing head on a rotating drum, erases two tracks of the recorded tape with the rotating erasing head, and then erases the recorded tape from the channel. The recording/reproducing head and the erasing head are arranged on the drum in a balanced manner so that the recording/reproducing head for channel 1 and channel 2 performs recording.

[Function] In the recording operation, after erasing two tracks with the rotating erasing head, the recording/reproducing head records, thereby achieving good recording/reproduction.

[Example] Next, an example of the present invention will be described based on the drawings.

First, as shown in the head arrangement state in the main part plan view of FIG.
The angle between the recording and reproducing heads 12 of channel 2 is 120°, and the angle between the recording and reproducing head 12 of channel 2 and the erasing head 13 is
The erasing head 13 and the recording/reproducing head 11 of channel 1 are arranged at a 120° position, and each head 11, 12, 13 rotates in the counterclockwise direction shown in the figure, which is the same as the running direction of the tape 14. . Here, the effective tracks Tw of each head 11, 12, 13,
Tw′, Tw− The lower end step of _ER is the track pitch Tp, shown in the tape recording pattern diagram in FIG. 1d,
As shown in Figure b, the recording/reproducing head 11 of channel 1 is Tp×1/3 higher than the recording/reproducing head 12 of channel 2, and
is than the recording/reproducing head 11 of channel 1.
It is placed Tp×1/3 higher.

Here, Tp = Tp' is the recording pattern track width of the magnetic tape, and Tw and Tw' are channels 1 and 2.
The effective track width of the recording and reproducing heads 11 and 12, Tw- _ER , is the effective track width of the erasing head 13, which has the relationship Tw- _ER =2Tp.

FIG. 2 is an explanatory diagram of the operation of the recording and reproducing circuit around the head of the magnetic recording and reproducing apparatus according to the present invention. During reproduction, transistor switches SW ₄ and SW' ₄ are turned OFF;
Transistor switch SW ₃ is turned ON and used for erasing.
DSC, OSCAMP, REC circuit, and RECAMP do not work. Also, the rotational position of the rotating magnetic head is
As shown in the figure, N and S permanent magnets rotate together with the rotating magnetic head, facing 180 degrees, and the DTP pulse signal as a reference signal is generated by the Hall element mounted at a fixed position or the detection element 15 of the magnetic head. , during playback, use M・M(A) and (B) to create the R・SFF signal shown in Figure 3, and switch transistor switch SW ₅ to obtain the playback envelope signals of channel 1 and channel 2. It is configured as follows.

Next, during recording, the transistor switch _SW4 ,
SW′ ₄ and SW ₃ are reversed from those during playback, and OSC,
OSCAMP, REC circuit, and RECAMP operate,
M.M.(C) is triggered by the S pulse of DTP, M.M.(D) is wound at 90 degrees, and switch SW ₁ is turned on to cause an erase current to flow through the erase head 13.

From the above, when the recording/reproducing heads 11, 12, and 13 of the magnetic recording/reproducing apparatus according to the present invention are arranged on the drum 10 as described above for recording/reproducing, the recording/reproducing head 11 of channel 1 and the recording/reproducing head 11 of channel 2 are arranged on the drum 10 as described above. When recording with the recording/reproducing head 12 of The large shape makes it easy to assemble.

Furthermore, FIG. 4 is a diagram showing the mounting positions of heads showing a second embodiment of the present invention, in which the recording/reproducing head 11 for channel 1 and the recording/reproducing head 1 for channel 2 are shown.
The distance between channel 1 is 180° - 2α°, and the distance between the recording/reproducing head 11 and erasing head 13 of channel 1 is 90° + α°, and α° is
A weight balancing weight 16 is provided 180° opposite the erasing head 13 by less than 10°. Here, the erasing head 13 is spaced 90°+α° from the recording/reproducing head 11 of channel 1 and the recording/reproducing head 12 of channel 2, and the recording/reproducing head 11, 12 of channel 1 or channel 2 is connected to the tape 1.
When the tape 4 is in contact with the tape 14 at a winding angle of 90°, the erasing head 13 does not contact the tape 14, so that the recording current is not affected by the erasing current. This means that the accuracy of M・M(C), (D) does not need to be high, and if the cross stroke of the rotary transformer and its surroundings is high, the switches SW ₁ , M・M(C), (D) will be It will no longer be necessary.

Next, FIG. 5 is a diagram showing the mounting positions of square heads 11, 12, and 13 on a drum 10 showing a third embodiment of the present invention. recording head 13 and recording/reproducing head 1 for channels 1 and 2
The angle between 1 and 12 is 90°.

[Effect] Therefore, according to the magnetic recording/reproducing apparatus according to the present invention having the above configuration, there is no effect of the erase current when recording with the recording/reproducing head of channel 1 and when recording with the recording/reproducing head of channel 2. This makes it possible to have a good weight balance between the head weight in the rotating part.In addition, when installing the rotating head on a small-diameter drum, the head installation space can be increased, which allows the shape of the head base to be enlarged, making assembly easier. That's what you get.

[Brief explanation of drawings]

FIG. 1a is a plan view of main parts showing an embodiment of the present invention;
b is an explanatory diagram showing the head level difference, c is an explanatory diagram showing the track width of each head, d is a recording pattern diagram according to the present invention, and FIGS. 2 and 3 are circuit diagrams of the recording/reproducing circuit according to the present invention. and operation diagram, 4th
5 are plan views of essential parts showing another embodiment of the present invention, and FIGS. 6a and 6 b are plan views of main parts and recorded patterns showing a conventional example. 10... Drum, 11, 12... Recording and reproducing head, 13... Erasing head, 14... Tape,
15...detection element, 16...weight.

Claims (1)

[Claims for Utility Model Registration] (1) In a rotating magnetic recording/reproducing device in which a tape is wound at a 90° angle around a drum having a rotating magnetic head, recording/reproducing heads and erasing heads for channels 1 and 2 are provided. A magnetic recording/reproducing device characterized in that the heads of channel 1 and channel 2 are arranged on a drum in a range of 120° to 180°, and the head of channel 1 and the erase head are arranged in a range of 90° to 120°. (2) The magnetic recording and reproducing device according to claim 1, wherein the recording/reproducing head and the erasing head of channel 1 and channel 2 are arranged on the drum at equal intervals of 120°, respectively. Device. (3) Registration of a utility model characterized in that the distance between the recording and reproducing heads of channel 1 and channel 2 is 180° - 2α°, and the distance between the erasing head and the recording and reproducing head of channel 1 is 90° + α°. A magnetic recording/reproducing device according to claim 1. (4) Utility model registration claim 1, characterized in that the distance between the recording and reproducing heads of channel 1 and channel 2 is 180°, and the distance between the erasing head and the recording and reproducing head of channel 1 is 90°. The magnetic recording and reproducing device described in . (5) The magnetic recording and reproducing apparatus according to any one of claims 3 to 4, which is characterized in that a balancing weight is added at a 180° position of the erasing head.